Ukrainian group Cyber Hunta released hacked emails from the office of one of Putin’s top aides Vladislav Surkov, which reveal Russia’s involvement in the separatist movement in Ukraine, NBC News reported.

The emails detail Russia’s deep involvement in Russian-speaking regions of the Ukraine, which has led to a divided country and Russia’s takeover of Crimea. Surkov has been a close aide Putin for over a decade, serving as deputy prime minister and Putin’s deputy chief of staff. The 2,337 hacked emails from 2014 show his micro-managing of the Ukrainian situation, proving that he managed Russia’s most crucial operations.